Saturday, May 30, 2009

[Electric Boats] Re: Recommendations for a 48volt to 12 volt dc to dc converter?



After several failed experiments (my loss your gain) I am using 2 of Thunderstruck's inexpensive 10amp controllers in parallel. I see no RF interference issues (you have to have faith and connect your 12V and 48V negatives - I was expecting ghostbuster-like fireworks...).

Ideally - figure out your max amp draw then build for 150% of that - so on my boat 20amps is about max (water pressure, lights, sumps) - I should ideally have 3 ganged together for N+1 redundency. They are so cheap (~$25) as to be nearly disposable so carry a spare. The other cool thing to think about is running a +48V "backbone" and converting locally where the power is needed. I built up a breadboard with a +48 bar, and a dual-bus +-12V and then connected the -12V and -48V.

The downside to these units is they can't charge a 12V battery as they put out exactly 12V.

I have lost a couple in playing around - one where I probably reversed the polarity the other where I am somewhat suspicious that back-emf from a fan got to it. In both cases they got real hot and a cap popped.

Anyway, been running with these for a couple of months now and no troubles.

-Keith

--- In electricboats@yahoogroups.com, "lmfelder" <lamarfelder@...> wrote:
>
> I have a columbia 36 that I have converted to electric and I want to add a 48 to 12 volt dc to dc converter -- does anyone have any recommendations as to brand or where to get etc? I had been using one bank to power my motor and one bank for house but I would rather increase my range and just pull house of of the 48 volt bank.
>
> Thanks
>

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